MR Angiography with Three-Dimensional Time-of-Flight and Targeted Maximum-Intensity-Projection Reconstructions in the Follow-up of Intracranial Aneurysms Embolized with Guglielmi Detachable Coils
Veikko J. Kähärä
,a,
Seppo K. Seppänena,
Pertti S. Ryymina,
Pentti Mattilaa,
Timo Kuurnea and
Erkki M. Laasonena
a From the Departments of Radiology (V.J.K., S.K.S., P.S.R., P.M., E.M.L.) and Neurosurgery (T.K.), Tampere University Hospital, Finland.
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FIG 1. Ruptured aneurysm originating from anterior communicating artery.
A, DSA image, oblique projection, right internal carotid injection, shows the aneurysm (arrowhead) before embolization.
B, DSA image, semiaxial projection, right internal carotid injection 3 months after treatment with electrolytically detachable coils, shows remnant cavity (arrows) in the neck area.
C, MR angiogram, targeted coronal MIP reconstruction, shows faint signal intensity between the proximal anterior cerebral arteries (large arrow), which was not interpreted as an aneurysmal remnant. Note the local encroachment of the anterior cerebral arteries (small arrows).
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FIG 2. Unruptured aneurysm of the right carotid termination.
A, DSA image, anterior projection, right internal carotid injection, shows the aneurysm (arrowhead) before embolization.
B, Four months after treatment, the aneurysm is subtotally packed with electrolytically detachable coils. The remnant cavity (arrow) is faintly seen through the subtracted coil mass.
C, MR angiogram, targeted parasagittal MIP reconstruction, clearly shows the remnant cavity (arrow).
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FIG 3. Giant unruptured aneurysm originating from the bifurcation of the right ophthalmic artery.
A, DSA image, oblique projection, right internal carotid injection 4 months after treatment, shows the aneurysm is subtotally packed with electrolytically detachable coils. A remnant cavity (arrowheads) is seen in the neck area.
B, MR angiogram, targeted coronal MIP reconstruction, shows scattered high signal intensity in the upper part of the aneurysm (small arrows) in addition to the remnant cavity flow (large arrow) in the neck area.
C, T1-weighted MR image, sagittal view, shows high signal intensity in the upper part of the coiled aneurysm (arrows), which does not represent flow but T1 shortening caused by thrombosis between the coil material.
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